Microstructure and Wear Behavior of Squeezed Magnesium Alloy (AM100) Based Composites Reinforced with ZrB₂, Graphite and Hybrid of ZrB₂ and Graphite Particles

Abstract:

An attempt has been made to investigate the microstructures and wear behavior of magnesium alloy AM100 (Mg-Al-Mn) based composites reinforced with 7 vol. % of ZrB₂, graphite or hybrid of (1:1) ZrB₂ and graphite particles as well as the unreinforced magnesium alloy. Magnesium alloy was melt under shield of inert gases and composites were prepared using stir casting method. Optical microscopy was used to study the microstructures of the unreinforced alloy and composites. The composites characterized primarily by the uniform distribution of particles in the matrix and a good adherence between the particles and matrix. XRD analysis was used to identify the phases of the unreinforced alloy and composites. The XRD diffraction pattern of AM100 matrix reveals different phases, namely, Mg, AlMn and Al₁₂Mg_17. Formation of these phases is due to the reaction between alloy constituents. Dry sliding wear tests were conducted by using a pin-on-ring apparatus. The wear rates of the composites and matrix alloy were measured at loads of 10, 20 and 30 N, and sliding speed of 0.7 m/s. The worn surfaces of the composite pins were examined by scanning electron microscopy (SEM). The experimental results of the wear tests showed that the magnesium based composites exhibited higher wear rate at all the applied loads when compared to those of the unreinforced magnesium alloy. The ZrB₂ reinforced magnesium composite exhibited the lowest wear rate amongst the composites material investigated in the present work.

• Periodical: Key Engineering Materials (Volume 835)
• Pages: 155-162
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.835.155
• Online since: March 2020
• Authors: Malak Abou El-Khair, Fatma Firouz*, Ahmed Lotfy, Essam Mohamed, Atef Daoud
• Keywords: Metal-Matrix Composites, Mg Alloy, Microstructure, Squeeze Casting, Wear Behavior

References

[1] S. Jayalakshmi, S.V. Kailas and S. Seshan: Composites Part A 33, 2002, 1135–1140.

[2] P.K. Biswas, S.C. Dev and C.S.S. Krishnan: Ind Foundry J, 45(3), 1999, 17–26.

[3] G. Chadha, J.E. Allison and J.W. Jones: Metallurgical and Materials Transactions A-vol. 38A, 2007, 286-297.

[4] D.J. Sakkinen: SAE Technical Paper No. 940779, SAE, Detroit, MI, (1994).

[5] M. Murray, and R. Esdaile: SAE Technical Paper No. 1999–01-0928, SAE, Detroit, MI, (1999).

[6] D. Rodrigo, M. Murray, H. Mao, J. Brevick, C. Mobley, V. Chandrasekar, and R. Esdaile: SAE Technical Paper No.1999-01-0927, SAE, Detroit, MI, (1999).

DOI: 10.4271/1999-01-0928

[7] T.K. Aune, D.L. Albright, and H. Westengen: SAE Technical Paper No. 900792, SAE, Detroit, MI, (1990).

[8] S. Seshan, M. Jayamathy, S.V. Kailas and T.S. Srivatsan: Materials Science and Engineering A363, 2003, 345–351.

[9] L. Lu, C.Y.H. Lim and W.M. Yeong: Composite Structures, 66 ,2004, 41–45.

[10] M.R. Krishnadev, R. Angers, C.G. Krishnadas Nair and G. Huard: JOM, 1993,8:52.

[11] V. Laurent, P. Jarry, G. Regazzoni and D. Apelian: J Mater Science,1992;27:4447.

[12] S.C. Sharma, B. Anand and M. Krishna: Wear 241,2000,33–40.

[13] M.Krishna, Reviews on advanced materials science, July, (2015).

[14] Q.Qing-ju: Transactions of Nonferrous Metals Society of China,16,2006,1135-1140.

[15] A. Bochenek and K.N. Braszczyn´ska: Materials Science and Engineering, A290, 2000, 122-127.

[16] K.Soorya, P.Balasundar, S.Nagaraja, P.M. Gopal, V.Kavimani, Journal of magnesium and alloys, 4, 2016, 197-206.

DOI: 10.1016/j.jma.2016.08.001

[17] C.Y.H. Lim, D.K. Leo, J.J.S. and M. Gupta: Wear, 259, 2005, 620–625.

[18] A. Dey, K.M. Pandey, International journal of materials research, 109 (11), 2018, 1050-1070.